Tom Van Cutsem (2014-05-09T12:23:49.000Z)
domenic at domenicdenicola.com (2014-05-09T15:12:16.720Z)
Another possibility would be that existing client code itself extends property descriptors with new attributes (since descriptors returned by gOPD are always extensible), and can then get confused when proxies pre-populate these descriptors with their own custom attributes. But again, this is highly unlikely. I think allowing proxies to accept/return custom attributes remains feasible.